AD

Microsoft Active Directory

DN

(LDAP) Distinguished Name

FQDN

Fully Qualified Domain Name

GID

Group ID (system user group identifier)

GNU

GNU project (GNU is Not Unix)

HTML

HyperText Markup Language

HTTP

HyperText Transfer Protocol

HTTPS

HyperText Transfer Protocol Secure (via SSL/TLS)

ID

Identifier

IMAP

Internet Message Access Protocol (email protocol)

IP

Internet Protocol

LDAP

Lightweight Directory Access Protocol

MBR

Master Boot Record

MDA

Mail Delivery Agent (email delivery agent)

MTA

Mail Transfer Agent (email server)

MUA

Mail User Agent (email client)

OID

(SNMP) Object ID

OS

Operating System

PID

Process ID (system process identifier)

PAM

Pluggable Authentication Modules

POP

Post Office Protocol (email protocol)

RPM

Red Hat Package Manager

RRA

Round-Robin Archive

RRD

Round-Robin Database

SMTP

Simple Mail Transfer Protocol (email protocol)

SNI

Server Name Indication

SNMP

Simple Network Management Protocol

SP

Service Pack

SSH

Secure Shell

SSL

Secure Sockets Layer

TCP

Transmission Control Protocol

TLS

Transport Layer Security

UID

User ID (system user identifier)

URI

Uniform Resource Identifier

URL

Uniform Resource Locator

VBR

Volume Boot Record